How to Calculate Part-Time Work Hours Per Week

If you work part-time, knowing your part time hours per week helps you understand your schedule, estimate your paycheck, compare job offers, and track your actual working time.

There is no single number of hours that makes a job “part-time” in every situation. Employers, benefit programs, and laws can use different definitions. For example, the U.S. Department of Labor states that the Fair Labor Standards Act (FLSA) does not define full-time or part-time employment; the employer generally determines the classification. U.S. Department of Labor

So, instead of relying on a label, the easiest approach is to calculate the hours you actually work each week.

What Are Part-Time Hours Per Week?

Part-time hours per week are the total number of hours an employee is scheduled to work during a typical seven-day workweek.

For example:

• 4 hours per day × 5 days = 20 hours per week

• 5 hours per day × 4 days = 20 hours per week

• 6 hours per day × 3 days = 18 hours per week

• 8 hours per day × 3 days = 24 hours per week

A part-time schedule can therefore look very different from one job to another.

How to Calculate Part-Time Work Hours Per Week

The basic formula is:

Weekly Work Hours = Hours Worked Per Day × Number of Workdays Per Week

If your schedule changes from day to day, add the hours for each day instead.

Example 1: Same Hours Every Day

Suppose you work:

• Monday: 5 hours

• Tuesday: 5 hours

• Wednesday: 5 hours

• Thursday: 5 hours

Calculate:

5 + 5 + 5 + 5 = 20 hours

Your part-time schedule is 20 hours per week.

Example 2: Different Hours Each Day

Suppose your weekly schedule is:

Add the daily hours:

4 + 6 + 5 + 4 + 3 = 22 hours

Your total is 22 part-time hours per week.

How to Calculate Weekly Hours From Start and End Times

If you know your start and end times, first calculate the hours worked during each shift.

The basic formula is:

Hours Worked = End Time − Start Time − Unpaid Breaks

For example, suppose you work from 9:00 AM to 2:00 PM with no unpaid break.

That is:

2:00 PM − 9:00 AM = 5 hours

If you work this schedule four days a week:

5 × 4 = 20 hours per week

You can also use a Work Hours Calculator to calculate daily and weekly work hours while accounting for breaks and working days.

How to Calculate Part-Time Hours With an Unpaid Break

Unpaid breaks should be removed when calculating actual working time, when the break is not counted as work time under the applicable rules.

For example:

• Start: 9:00 AM

• End: 4:00 PM

• Unpaid break: 30 minutes

The total time between 9 AM and 4 PM is 7 hours.

Subtract the 30-minute break:

7 hours − 0.5 hours = 6.5 hours

So you worked 6 hours 30 minutes that day.

If you work four days:

6.5 × 4 = 26 hours per week

Your weekly total is 26 hours.

How to Calculate Part-Time Hours From a Weekly Schedule

A simple weekly schedule can be calculated by adding each day's working time.

For example:

• Monday: 4 hours

• Tuesday: 5 hours

• Wednesday: 4.5 hours

• Thursday: 6 hours

• Friday: 3.5 hours

Add them:

4 + 5 + 4.5 + 6 + 3.5 = 23 hours

Therefore, you work 23 hours per week.

This method is especially useful when your part-time schedule is not the same every day.

How to Calculate Part-Time Hours for Multiple Shifts

Some part-time workers have two separate shifts on the same day. In that situation, calculate each shift separately and then add them.

For example:

Morning: 8:00 AM–12:00 PM = 4 hours
Evening: 4:00 PM–7:00 PM = 3 hours

Total:

4 + 3 = 7 hours

If you work this schedule three days a week:

7 × 3 = 21 hours per week

For more complicated schedules involving multiple shifts, overnight work, breaks, and weekly totals, see the guide on calculating hours worked across multiple shifts.

How to Calculate Part-Time Hours With Different Shifts

Consider this weekly schedule:

Add the hours:

5 + 5 + 4 + 5 + 0 = 19 hours

The employee works 19 hours per week.

How to Convert Minutes to Decimal Hours

Payroll systems and timesheets may use decimal hours.

Use this formula:

Decimal Hours = Minutes ÷ 60

Common conversions include:

• 15 minutes = 0.25 hours

• 30 minutes = 0.50 hours

• 45 minutes = 0.75 hours

• 60 minutes = 1 hour

For example, if you work 5 hours 30 minutes:

30 ÷ 60 = 0.5

So:

5 hours 30 minutes = 5.5 hours

If you work 5.5 hours for four days:

5.5 × 4 = 22 hours per week

Important: 30 Minutes Is Not 0.30 Hours

A common mistake is writing 5 hours 30 minutes as 5.30 hours.

For decimal calculations, 30 minutes equals 0.50 hours, so the correct value is:

5.50 hours

How Many Hours Is Part-Time Work?

There is no universal weekly number that applies to every part-time job.

You may see schedules such as:

• 10 hours per week

• 15 hours per week

• 20 hours per week

• 24 hours per week

• 25 hours per week

• 30 hours per week

But the classification depends on the employer, workplace policy, benefits rules, contract terms, and applicable law. In the United States, the FLSA itself does not establish a specific number of weekly hours for part-time employment. U.S. Department of Labor

Therefore, if you need to know whether a particular job is officially considered part-time, check the employer's policy or the applicable program or agreement rather than assuming a fixed number.

Part-Time Hours vs. Full-Time Hours

It is useful to distinguish between calculating your hours and classifying your employment.

For example, someone could work 24 hours in one week and 30 hours the next week. The actual hours are easy to calculate, but whether the employee is officially classified as part-time depends on the applicable rules.

Your weekly calculation tells you how much you worked. It does not automatically determine your legal or employment classification.

How to Calculate Average Part-Time Hours Per Week

If your schedule changes from week to week, you can calculate an average.

Use:

Average Weekly Hours = Total Hours Worked ÷ Number of Weeks

For example:

• Week 1: 18 hours

• Week 2: 22 hours

• Week 3: 20 hours

• Week 4: 24 hours

First find the total:

18 + 22 + 20 + 24 = 84 hours

Then divide by four weeks:

84 ÷ 4 = 21 hours

Your average is 21 hours per week.

This can be useful when your work schedule changes regularly.

Common Mistakes When Calculating Part-Time Hours

1. Counting the Entire Time at Work

Being at the workplace for 7 hours does not necessarily mean you worked 7 hours if there was an unpaid break that should not be counted.

2. Forgetting One Workday

When adding weekly hours, check every day from Monday through Sunday or use the workweek defined by your employer.

3. Treating Minutes as Decimal Numbers

Remember:

30 minutes = 0.50 hours

not 0.30 hours.

4. Counting Time Between Split Shifts

If you work from 8 AM–12 PM and 4 PM–7 PM, the four hours between the shifts are not automatically working hours.

Calculate each shift separately.

5. Assuming a Fixed Definition of Part-Time

Do not assume that a particular number of hours always means part-time. Definitions can vary by employer and program.

Quick Formula for Part-Time Hours Per Week

For a consistent schedule:

Part-Time Hours Per Week = Hours Per Shift × Shifts Per Week

For example:

5 hours × 4 shifts = 20 hours per week

For a changing schedule:

Part-Time Hours Per Week = Monday Hours + Tuesday Hours + Wednesday Hours + ...

For schedules with breaks:

Weekly Hours = Total Scheduled Time − Applicable Unpaid Breaks

Frequently Asked Questions

How many hours is part-time per week?

There is no single universal number. A part-time schedule might be 10, 20, 25, or 30 hours per week, depending on the employer and applicable rules.

Is 20 hours a week part-time?

A 20-hour weekly schedule is commonly described as part-time, but the official classification depends on the employer or applicable rules.

Is 30 hours a week part-time?

It can be, depending on the employer's definition and the applicable program or agreement. There is no universal FLSA definition of part-time employment.

How do I calculate my weekly work hours?

Add the actual hours worked for each day of the week. If you have a consistent schedule, multiply your hours per shift by the number of shifts per week.

How do I calculate part-time hours with breaks?

Calculate the total shift duration and subtract applicable unpaid break time. Then add the working hours for each day.

How do I calculate average weekly hours?

Add the total hours worked over several weeks and divide by the number of weeks.

Average Weekly Hours = Total Hours Worked ÷ Number of Weeks

How many hours is 4 hours a day for 5 days?

4 × 5 = 20 hours per week.

How many hours is 6 hours a day for 3 days?

6 × 3 = 18 hours per week.

Conclusion

Calculating part time hours per week is straightforward once you separate each work period and account for applicable unpaid breaks.

For a regular schedule, multiply your hours per shift by the number of shifts you work each week. For an irregular schedule, calculate each day's working time and add the daily totals.

For example:

5 hours × 4 days = 20 hours per week

If your schedule changes frequently, calculating your weekly and average hours can make timesheets, payroll estimates, and schedule planning much easier.

For U.S. workers, remember that the number of hours that officially counts as “part-time” can depend on the employer and applicable rules rather than one universal federal threshold.